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I have lead around my windows and after a new lead installation there has been a stain there for over a year. I have tried window cleaner and multi-surface cleaner but no success.

I had an 'easy clean' treatment applied to the windows when I bought them and wonder if the fix to remove this stain then will also affect the treatment.

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I have never heard of lead used in window installation, even before it was phased out of the construction industry. Are theses single glazed windows, insulated glass, or stained glass laminated? Or maybe even something else? Lead is used to MAKE/ASSENBLE stained glass, not install. – Jack Mar 14 '14 at 12:42
Lead was used to make the glass roof water tight ie Where the glad joined the wall – user10269 Mar 14 '14 at 21:26

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